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Posted By homemade,
Dec 22, 2012 at 8:56 AM
Don't forget those space rocks that keep on a coming down.
fingers crossed they stay small
so a boiler, then?
that would explain the height.
cool project. would love to see more of it.
what is the space it's heating?
Some day we'll have fusion stoves and the ash left will weigh less than the pellet.
I thought it was 5.
surely you mean 42.
Please don't call me Shirley.
I don't think you can use the weight of the burnt pellets as efficiency. Efficiency would be something like BTU available in the pellets (approximatly 8700 BTU's per pound) / BTU's lost up the vent. Which assumes the remaining BTUs go into heating the house.
%Efficiency = (BTUout / BTUin) x 100
%Efficiency = ((BTUin - BTUlost) / BTUin) x 100
I think that 8700 BTU / pound may be a little too high. Actual energy yeild is reduced by moisture content of the pellets. That is the energy used to drive the absorbed water back into a vapor state.
By the way, the relative humidity where the pellets are stored will affect the BTU's available because wood will reach an equilibrium moisture content with the air based on the relative humidity of the air. This is why wood changes dimensions winter to summer.
So thus far we've learned that A) Harman stoves convert 100% of the potential wood pellet energy into 101% heat energy (even NEWP).... and B) NEWP are still wicked ashy? Correct?